OWINGS MILLS, Md. — Ravens head coach John Harbaugh didn’t offer a specific list of adjustments to be made to an anemic running game, but the head coach isn’t shying away from the biggest problem that plagues his 3-3 team, either.

Addressing the media a day after a disappointing 19-17 loss to the Green Bay Packers in which the Ravens gained just 47 yards on 22 carries to continue a season-long inability to run the football, Harbaugh acknowledged that he and his coaching staff aren’t standing pat with a struggling offensive line. While most fingers are pointed in the direction of new run-game coordinator Juan Castillo and second-year center Gino Gradkowski, the head coach repeatedly said all individuals invested in the running game — coaches, offensive linemen, and running backs — need to make improvements as the Ravens rank 31st in the league with their 2.7 yards per carry average.

“We’re definitely making changes. We’re not going to sit there and just stand pat with what we’re doing,” Harbaugh said. “It may not be visible from the outside looking in, but they’re visible to the people we play against, and they’re definitely visible to us. We know what changes we’re making, whether it’s personnel changes or, more likely, scheme changes. Not major things, just things that will give our guys a better chance to be on the same page. That’s what we need to do.

“We’ve got too many situations where we don’t have a hat on a hat. When you don’t have a hat on a hat, that’s a problem. That’s just not acceptable.”

Harbaugh mentioning the inability to simply find one-on-one matchups suggests the Ravens could be moving away from Castillo’s zone blocking scheme that relies on lateral movement, timing, and finding the proper positioning and angles and moving toward a man-power approach that involves more physicality and simply identifying a defender to block based on how the defense is lined up before the snap.

The Ravens have repeatedly been dominated at the line of scrimmage this season, with many observers seeing too much hesitation and a lack of proper communication in identifying blitzes and stunts. Harbaugh has repeatedly downplayed the changes made by Castillo this season, but the acknowledgement of scheme adjustments being made suggests what the former Eagles offensive line coach has tried to implement hasn’t worked well with the personnel up front.

“We’re not stuck on any particular scheme or any particular technique or any particular way of doing something,” Harbaugh said. “We want to find the best way to do it, and we work hard at that, and we’ll continue to do that. We’re going to find our way into our run game.”

It remains to be seen whether there are any noticeable changes such as the possibility of A.Q. Shipley taking Gradkowski’s place in the starting lineup, but an attempt to simplify their overall strategy could at least provide short-term relief for a running game struggling to simply get back to the line of scrimmage far too often.

Of the Ravens’ 22 rushing attempts in Sunday’s loss to the Packers, five went for negative yardage and six netted no gain as quarterback Joe Flacco and the passing game were constantly faced with third-and-long situations because of such little success on first and second down. There were a few occasions where a delayed blitzer came untouched to blow up ballcarriers in the backfield.

“We had some mental mistakes, some errors that just cost us,” Harbaugh said. “You need no runs for negative yards. There has got to be at least a gain of some kind moving forward. We’ve got to get a lot better at that.”

Even if a simplified man-power approach doesn’t provide as high of a ceiling in terms of explosive plays, increasing the yards-per-carry average to a respectable level — say even an underwhelming 3.5 yards per carry — would alleviate pressure on a passing game still evolving in its own right.

Whether the results improve this Sunday in Pittsburgh or we see much of the same from a running game that’s yet to get in gear as the bye week approaches, the Ravens need to change things up. All parties involved with the running game continue to say the right things, but it’s now clear that what was once thought as an early-season aberration is threatening to become a year-altering crisis with each week of ineffective rushing.

“Frustration can be a great motivator,” Harbaugh said. “I like that. Let’s be frustrated, and let’s go to work and see if we can get better.”

Jensen’s role moving forward

With Gradkowski not performing well and Shipley not drawing an opportunity at the center position to this point, many have turned their attention to sixth-round rookie Ryan Jensen and what role he might serve along the offensive line.

The Colorado State-Pueblo product finally returned to the practice field last week after breaking his foot in the first week of training camp in late July, but it’s unlikely the 6-foot-4, 318-pound lineman will be a factor on game days until after the bye. It’s clear the Ravens wanted to keep Jensen around as an option for 2013 since they refrained from placing him on season-ending injured reserve, but Harbaugh’s vision for Jensen — at least publicly — doesn’t suggest a move to the starting lineup anytime soon.

“He’ll be a backup to start with, and then we’ll see what he does from there,” Harbaugh said. “We haven’t seen much of him yet. Developmental backup — that will be his role.”

Truthfully, the Ravens are unsure what they really have with Jensen who only played at the Div. II level, but they like his upside as an interior lineman.